The device history report for lot number 8037787 was reviewed, no related abnormalities were found.Material number (b)(4) for lot 8037787 was manufactured on feb-18-2018.This is the first instance of this failure mode with this lot number.According to the sampling plan applied for product performance, this lot was accepted and released, with no defects being noted during final assembly or in packaging visual inspections.Unfortunately a sample could not be obtained for the purpose of the investigation.Investigation conclusion: without the ability to investigate the affected unit our quality engineers were unable to determine the root cause for this complaint.Based on investigation results to date, root cause for manufacturing process cannot be determined.
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